Leiodes yasudai, Hoshina, 2012

Hoshina, Hideto, 2012, Review of the tribes Sogdini and Leiodini from Japan and North Chishima Islands. Part II. Genera Hydnobius and Leiodes (Coleoptera: Leiodidae), Acta Entomologica Musei Nationalis Pragae (suppl. 1) 52, pp. 1-168 : 41-45

6. Leiodes yasudai sp. nov.

Japanese name: Daisetsu-ô-tamakinokomushi ( Figs. 6 , 21–23 , 111 )

Type locality. Japan, Hokkaido, Mts. Daisetsu, Mt. Kurodake.

Type material. JAPAN: HOKKAIDO: HOLOTYPE, ♀, Mts.Daisetsu,Mt. Kurodake , 4.ix.1990, N.Yasuda leg.( MNHAH). PARATYPE: 1 ♂, Mts. Daisetsu, Mikura-zawa, 7.–15.viii.1999, S. Hori leg. ( MNHAH). Opposite to the usual practice, I have designated the female specimen as the holotype, as the above male specimen is teneral.

Diagnosis. Body 2.8–3.0 mm long and ca. 1.8× as long as wide. Dorsum brownish. Elytra densely and strongly punctate between striae, and not transversely strigose between punctures. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Male metaventrite bearing erect and dense pubescence medially. Male mesotibia protuberant at interoapical corner. Male metatibiae strongly arcuate. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 2.8 mm; head 0.45 mm in length and 0.77 mm in width; pronotum 0.74 mm in length and 1.3 mm in width; elytra 1.9 mm in length and 1.6 mm in width.

Coloration (based on holotype only). Dorsum shining and brownish; elytra slightly paler than head and pronotum; antennomeres 1–6 and 8 brown; antennomere 7 a little darker than 6; antennomeres 9, 10, and basal 2/3 of antennomere 11 dark brown; apical 1/3 of antennomere 11 light brown; coxae, mesotrochanters, and metatrochanters brown; remaining parts of legs yellowish brown; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 2.8–3.0 mm in length, ca. 1.8× as long as wide.

Head ca. 1.7× as wide as long, ca. 0.61× as long as and 0.56× as wide as pronotum, distinctly punctate, bearing some large punctures ( Fig. 21A ); antennomeres 1–4 each longer than wide; antennomere 11 about as long as wide; remaining antennomeres each wider than long; antennomere 11 oval ( Fig. 21C ); relative lengths of antennomeres 2 to 11 – 2.8: 4.3: 1.9: 1.8: 1.6: 2.8: 1.0: 3.4: 3.1: 4.5.

Pronotum ca. 1.8× as wide as long, ca. 0.40× as long as and 0.87× as wide as elytra, widest at base, simply and very feebly curved at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 21A ).

Scutellum minutely punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 1/3 ( Fig. 21A ), not transversely strigose, densely and strongly punctate between striae, therefore superficially not appearing to bear rows of punctures ( Figs. 21A, 21B, 21F ); most punctures of elytra larger than those of head and pronotum ( Fig. 21A ); sutural stria fine, reaching from apex to ca. apical half of elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, without distinct excavation between median carina and transverse carina ( Fig. 21E ); median carina of mesoventrite low ( Fig. 21E ); metaventrite showing sexual dimorphism ( Figs. 21F, 21G ), sparsely and finely pubescent, and strongly microreticulate except for almost smooth middle portion.

Legs showing distinct sexual dimorphism of protarsi, protibia, mesotibia, mesotarsi, metafemur, and metatibia; metafemora weakly expanded at about apical 1/4 of posterior margins ( Figs. 22E, 22F ).

Male. Middle portion of metaventrite with dense erect pubescence ( Fig. 21F ); protibiae strongly curved inwards along dorsoapical margins in dorsal view ( Fig. 22G ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Figs. 22A, 22C ); mesotibia strongly protuberant and bearing a robust spine at interoapical corner ( Fig. 22C ); metafemur with a long dorsal projection posteroapically, projection curved inwards ( Fig. 22I ); metatibiae strongly arcuately curved ( Fig. 22E ); abdominal sternite 8 strongly curved ( Fig. 23C ); aedeagus slender ( Figs. 23A, 23B ); median lobe simply narrowed from apical 1/3 towards apex, rounded at apex in dorsal view ( Fig. 23A ), feebly curved and apically pointed in lateral view ( Fig. 23B ); each paramere bearing a small transparent lobe at apex ( Fig. 23A ); inner sac as shown in Fig. 23A .

Female. Middle portion of metaventrite with sparse erect pubescence ( Fig. 21G ); protibia not curved inwards on dorsoapical margin in dorsal view ( Fig. 22H ); protarsi and mesotarsi slender ( Fig. 22B, 22D ); mesotibia with a slender spine at interoapical corner ( Fig. 22D ); metafemur with a small dorsal projection posteroapically ( Fig. 22J ); metatibiae almost straight ( Fig. 22F ); abdominal sternite 8 with a spiculum ventrale at central point of anterior margin ( Fig. 23D ); coxites and stylus as shown in Fig. 23E .

Differential diagnosis. Leiodes yasudai sp. nov. is similar to L. circinipes ( Rye, 1873) in elytral punctation, but can be separated from it by having almost unicolor elytra and strongly curved male metatibiae ( Fig. 22E ). In contrast, L. circinipes has brownish elytra with black stripes near the elytral suture ( Fig. 16C ) and relatively weakly curved male metatibiae ( Figs. 17E, 17F ).

Etymology. This species is dedicated to the collector of the holotype, Dr. Nobunori Yasuda.

Distribution. Japan: Hokkaido (Daisetsu Mts.).

Figures

Fig. 6. Heads (A–I) and mandibles (J and K) of Leiodes spp. A – Leiodes yasudai sp. nov.; B – L. multipunctata (Rye, 1873); C – L. irregularis Hatch, 1929; D – L. osawai Nakane, 1963; E – L. yukihikoi sp. nov.; F – L. okawai Nakane, 1963; G – L. tanakai sp. nov.; H, J, K – L. lucens (Fairmaire, 1855); I – L. yoshidai sp. nov. Scale I: 0.5 mm for A–I; II: 0.2 mm for J and K.

Fig. 21. Leiodes yasudai sp. nov. A – body, dorsal view; B – ditto, lateral view; C – antenna; D – elytral punctures; E – mesoventrite, lateral view; F – male metaventrite; G – female metaventrite. Scale I: 1 mm for A and B; II: 0.5 mm for C; III: 0.5 mm for E; IV: 0.5 mm for F and G.

Fig. 22. Leiodes yasudai sp. nov. A – male fore leg, ventral view; B – female fore leg, ventral view; C – male middle leg, ventral view; D – female middle leg, ventral view; E – male hind leg, ventral view; F – female hind leg, ventral view; G –male protibia, dorsal view; H – female protibia, dorsal view; I – male metafemur, dorsal view; J – female metafemur, dorsal view. Scale I: 1 mm for A–D; II: 1 mm for E and F; III: 0.2 mm for G and H; IV: 0.5 mm for I and J.

Fig. 23. Leiodes yasudai sp. nov. A – aedeagus, dorsal view; B – ditto, lateral view; C – male abdominal sternite 8; D – female abdominal sternite 8; E – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.2 mm for C and D, and 0.1 mm for E.

Fig. 111. Distribution of Leiodes circinipes species group: (●) L. yasudai sp. nov., (■) L. juzoi sp. nov., (▲) L. yoshitakei sp. nov., (*) L. circinipes (Rye, 1873); circle by broken line – Mts. Daisetsu; arrow – suggested migration pathway of L. circinipes group from the continent to Japan.

Fig. 16. Leiodes circinipes (Rye, 1873).A – body, dorsal view; B – ditto, lateral view; C – dorsal color; D – antenna; E – elytral punctures; F – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for D; III: 0.5 mm for F.

Fig. 17. Leiodes circinipes (Rye, 1873).A – male fore leg, ventral view; B – female fore leg, ventral view; C – male middle leg, ventral view; D – female middle leg, ventral view; E – male hind leg, ventral view; F – ditto; G – female hind leg, ventral view; H – male metafemur, dorsal view; I – female metafemur, dorsal view; J – male protibiae, dorsal view; K – female protibiae, dorsal view. Scale I: 0.5 mm for A–D; II: 0.5 mm for E; III: 0.5 mm for F and G; IV: 0.2 mm for H and I; V: 0.2 mm for J and K.